Method and Apparatus for Generating a Reference Signal Sequence in a Wireless Communication System

1. A method of receiving, by a base station, a reference signal in a wireless communication system, the method comprising: transmitting a cell-specific group hopping parameter to a plurality of user equipments (UEs) in a cell, wherein the cell-specific group hopping parameter is used to disable a group hopping for the plurality of UEs in the cell; transmitting a cell-specific sequence hopping parameter to the plurality of UEs in the cell, wherein the cell-specific sequence hopping parameter is used to enable a sequence hopping for the plurality of UEs in the cell; transmitting a UE-specific sequence group hopping (SGH) parameter to a certain UE, among the plurality of UEs, wherein the UE-specific SGH parameter is used to disable the sequence hopping, enabled by the cell-specific sequence hopping parameter, for the certain UE; and receiving a reference signal, which is generated based on a base sequence number within a base sequence group, wherein the base sequence number within the base sequence group is determined by the UE-specific SGH parameter.

2. The method of claim 1 , wherein the cell-specific sequence group hopping parameter is a Group-hopping-enabled parameter transmitted through a high layer.

3. The method of claim 1 , wherein the cell-specific sequence hopping parameter is a Sequence-hopping-enabled parameter transmitted through a high layer.

4. The method of claim 1 , wherein the UE-specific SGH parameter is a Disable-sequence-group-hopping parameter transmitted through a high layer.

5. The method of claim 1 , wherein the base sequence number within the base sequence group in each slot is identical.

6. The method of claim 5 , wherein the base sequence number within the base sequence group in each slot is set to 0 according to the UE-specific SGH parameter.

7. The method of claim 1 , wherein a length of the reference signal is longer than 6N sc RB , where the N sc RB is a size of a resource block indicated by a number of subcarriers in a frequency domain.

8. A base station comprising: a radio frequency (RF) unit; and a processor coupled to the RF unit, and configured to: control the RF unit to transmit a cell-specific group hopping parameter to a plurality of user equipments (UEs) in a cell, wherein the cell-specific group hopping parameter is used to disable a group hopping for the plurality of UEs in the cell, control the RF unit to transmit a cell-specific sequence hopping parameter to the plurality of UEs in the cell, wherein the cell-specific sequence hopping parameter is used to enable a sequence hopping for the plurality of UEs in the cell, control the RF unit to transmit a UE-specific sequence group hopping (SGH) parameter to a certain UE, among the plurality of UEs, wherein the UE-specific SGH parameter is used to disable the sequence hopping, enabled by the cell-specific sequence hopping parameter, for the certain UE, and control the RF unit to receive a reference signal, which is generated based on a base sequence number within a base sequence group, wherein the base sequence number within the base sequence group is determined by the UE-specific SGH parameter.

9. The base station of claim 8 , wherein the cell-specific sequence group hopping parameter is a Group-hopping-enabled parameter transmitted through a high layer.

10. The base station of claim 8 , wherein the cell-specific sequence hopping parameter is a Sequence-hopping-enabled parameter transmitted through a high layer.

11. The base station of claim 8 , wherein the UE-specific SGH parameter is a Disable-sequence-group-hopping parameter transmitted through a high layer.

12. The base station of claim 8 , wherein the base sequence number within the base sequence group in each slot is identical.

13. The base station of claim 12 , wherein the base sequence number within the base sequence group in each slot is set to 0 according to the UE-specific SGH parameter.

14. The base station of claim 8 , wherein a length of the reference signal is longer than 6N sc RB , where the N sc RB is a size of a resource block indicated by a number of subcarriers in a frequency domain.